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1. NETW360 Week 2iLab: RF
Behavior Calculations
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NETW360 Week 2iLab: RF Behavior Calculations
NETW 360 Week 2 iLab: RF Behavior Calculations
Task 1: Power calculations
Use the calculator in the Power section to complete the following steps:
 On the lower UNII-1 band (i.e., 5.150–5.250 GHz with 100 MHz channels),the maximum outputpower ofthe
intentional radiator (IR) allowed by the FCC is 50 mW. The IR is also referred to as a wireless transmitter.
Click in the watts box and type 0.05 (50 mW = 0.05 watts).What is the dBm of 50 mW?
__________
 On the middle UNII-1 band (i.e., 5.250–5.350 GHz with 100 MHz channels),the maximum outputpower of the
intentional radiator (IR) allowed by the FCC is 250 mW.
Click in the watts box and type 0.25 (250 mW= 0.25 watts). What is the dBm of 250 mW?
__________

2.  On the upper UNII-1 band (i.e., 5.725–5.825 GHz with 100 MHz channels),the maximum outputpower ofthe
intentional radiator (IR) allowed by the FCC is 800 mW.
Click in the watts box and type the given power level in watts. What is the dBm of 800 mW?
__________
Scroll down to the Receive Sensitivity section.Review the information regarding receive sensitivity.
 The receive sensitivityof a LinksysWUSB600N wireless network adaptor at54 Mbps is -70 dBm. Click in the dBm
box and type -70. What are the watts of -70 dBm?
__________
 The receive sensitivityof a LinksysWUSB300N wireless network adaptor at54 Mbps is -68 dBm. Click in the dBm
box and type -68. What are the watts of -68 dBm?
__________
 If you have to choose between these adaptors based on their receive sensitivity at the bit rate of 54 Mbps, which
adaptor will potentiallyperform better in achieving the desired bitrate?
__________
Task 2: Cable loss calculations
Use the calculator in the Loss in a Coaxial Cable at 2.45 GHz section to complete the following steps:
 Next toChoose type of cable,selectLMR 400. This is a TMS cable that supports both 2.4 GHz and 5 GHz RF
signals.100 feet of such cable used on the 2.5 GHz range decreases the signal strength by about6.76 dB (that is,
6.76 dB signal loss per 100 feet).
 Click in the Length (meter) box and type 30.48 (100 feet = 30.48 meters).Click m→dB.What is the loss atthis
length? __________

3.  Click in the Length (meter) box and type 60.92 (200 feet = 30.48 meters).Click m→dB.What is the loss atthis
length? __________
 When the cable length doubles,how does the loss change,approximately? __________
Task 3: Antenna gain calculations
Use the calculator in the Antenna section to complete the following steps:
 Next to frequency band, select2.41–2.48 GHz.
 Next to antenna diameter in meters,type 0.1 (0.1 meters = 3.9 inches).This is an optional antenna thatcould be
added to an access point(AP).
 Click D→ dB. What is the maximum theoretical antenna gain? __________
 Next to frequency band, select5.15–5.85 GHz.
 Next to antenna diameter in meters,type 0.1 (0.1 meters = 3.9 inches)
 Click D→ dB. What is the maximum theoretical antenna gain? __________
 Given the same sized reflector,which signals,high-frequencyor low-frequency,can be more efficiently focused by
parabolic antennas (i.e.,resultin a higher antenna gain)?
__________
 Next to frequency band, select5.15–5.85 GHz.
 Next to antenna diameter in meters,type 0.2 (0.1 meters = 7.8 inches)
 Click D→ dB. What is the maximum theoretical antenna gain? __________
 Given the same signal frequency,which dish antennas,large-sized or small-sized,are more efficientat focusing
the signal (i.e.,resultin a higher antenna gain)?
__________
Task 4: Free space loss calculations
Use the calculator in the Free space loss section to complete the following steps:
 Next to frequency band, select2.41–2.48 GHz.
 Next to kilometers,type 0.1 (100 meters = 0.1 kilometers).
 Click dB← km. What is the free space path loss in dB? __________
 Change the frequency band to 5.15–5.85 GHz.

4.  Next to kilometers,type 0.1 (100 meters = 0.1 kilometers).
 Click dB← km. What is the free space path loss in dB? __________
 How does the free space path loss for 802.11a (operating on the 5 GHz band) compare with 802.11g (operating
on the 2.4 GHz band)? __________
 Next to frequency band, select2.41–2.48 GHz.
 Next to kilometers,type 0.02 (20 meters = 0.02 kilometers).
 Click dB← km. What is the free space path loss in dB? __________
 Next to kilometers,type 0.04 (40 meters = 0.04 kilometers).
 Click dB← km. What is the free space path loss in dB? __________
 Next to kilometers,type 0.08 (80 meters = 0.08 kilometers).
 Click dB← km. What is the free space path loss in dB? __________
 When the distance doubles,how does free space path loss in dB change?
___________________________________
 Next to frequency band, select17.1–17.3 GHz.
 Next to kilometers,type 1.
 Click dB← km. What is the free space path loss in dB? __________
 Next to kilometers,type 2.
 Click dB← km. What is the free space path loss in dB? __________
 Next to kilometers,type 4.
 Click dB← km. What is the free space path loss in dB? __________
 When the distance doubles,how does free space path loss in dB change?
___________________________________
Task 5: Link budget calculations
Use the calculator in the Link budget section to complete the following steps:
 Enter the following values for an office WLAN:
Transmit—
Transmitoutputpower:+15 dBm
Cable loss: -6 dB
Antenna gain:+2 dBi
NOTE: the previous values are used to compute effective isotropicallyradiated power (EIRP): (+15 dBm) + (-6 dB) +
(+2 dBi) = 11 dBm.By definition,EIRP is the amountofpower an ideal isotropic radiator can generate.In reality,
EIRP is the power radiated from an antenna;it is regulated by the FCC.
Propagation—
Free space loss: -81 dB

5. Reception—
Antenna gain:+2 dBi
Cable loss:-4 dB
Receiver sensitivity: -80 dBm
 Click Compute.What’s the total remaining margin in dB? __________
 Is this margin sufficientto accommodate received signal fluctuations? Why?
_________________________________________
 Enter the following values for a 10-killometer outdoor transmission link:
Transmit—
Transmitoutputpower:+10 dBm
Cable loss: -3 dB
Antenna gain:+25 dBi
NOTE: the previous values are used to compute effective isotropicallyradiated power (EIRP): (+10 dBm) + (-3 dB) +
(+25 dBi) = 32 dBm. EIRP is regulated by the FCC.
Propagation—
Free space loss: -120 dB
Reception—
Antenna gain:+25 dBi
Cable loss: -3 dB
Receiver sensitivity: -80 dBm
 Click Compute.What’s the total remaining margin in dB? __________
 Is this margin sufficientto accommodate received signal fluctuations? Why?
____________________________________________

6. Task 6: Link budget calculations
Use the calculator in the Fresnel ellipsoid section to complete the following steps:
 Next to distance “D” between transmitter and receiver [meters],type 114.This is close to the maximum distanceof
an office WLAN.
 Next to distance “d” between transmitter and obstacle [meters],type 65. This assumes an obstacle is atthe
midpointbetween two antennas.
 Click Compute radius.What’s the radius ofthe Fresnel zone at the middle point? ________
 Next to distance “D” between transmitter and receiver [meters],type 16000.This refers to an approximately10 -
mile outdoor point-to-pointtransmission link.
 Next to distance “d” between transmitter and obstacle [meters],type 4800.The obstacle is about3 miles from one
antenna.
 Click Compute radius.What’s the radius ofthe Fresnel zone at this specific location?